Code No.U1190 No receive fault detect signal
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- If diagnosis code No. U1190 is set, be sure to diagnose the CAN bus line.
- Whenever the ECU is replaced, ensure that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
The headlamp automatic levelling-ECU sets diagnosis code No.U1190 when it cannot receive signals from the ETACS-ECU.
JUDGEMENT CRITERIA
ETACS-ECU sends the diagnosis code (U code) detection permission or prohibition signal to each ECU connected to the CAN bus line. If the headlamp automatic levelling-ECU cannot receive the diagnosis code (U code) detection permission or prohibition signal for 2.5 seconds after turning the ignition switch to ON position, diagnosis code U1190 will be set.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of ETACS-ECU
- Malfunction of headlamp automatic levelling-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting 
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STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set in the ETACS-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the ETACS-ECU (Refer to ).
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN communication-linked systems below, is set.
Combination meter
- Code No.U1190: No receive fault detect signal
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set in the headlamp automatic levelling-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the ETACS-ECU (Refer to ) and then go to Step 6.
A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the headlamp automatic levelling-ECU and the ETACS-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
STEP 5. Diagnosis code recheck
Check again if the diagnosis code is set in the headlamp automatic levelling-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the headlamp automatic levelling-ECU (Refer to ) and then go to Step 6.
A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the headlamp automatic levelling-ECU and ETACS-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
STEP 6. Check whether the diagnosis code is set again.
Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)On completion, check that the diagnosis code is not set again.
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Q.
Is the diagnosis code set?
Go to Step 1.
The procedure is complete.